In short
If LG OLED eARC has no sound, it is usually cable (eARC-capable), wrong HDMI port, bar mode, CEC, or software — not the power supply board.
Try pass-through/optical, test TV speakers, update TV+bar firmware.
Practical checks
Audio path:
- eARC-capable HDMI cable
- Only the eARC-marked port
- CEC on
- Bar set to eARC/ARC
- TV firmware current
Versus the power supply board
Only with dead set / blink / standby failure might the power supply board play a part — stays black / repair. Related: HDMI no signal.
AmparioWeb
We help with boards — pure audio: checklist and support. Dead set: repair.
Frequently asked questions
- Optical works, eARC not?
- Often cable/port/handshake — not the power supply board.
- Related to HDMI no signal?
- Yes — HDMI no signal.
- AmparioWeb?
- For board issues yes. Pure audio: support.
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Power boards for LG OLED — tested under load, 12-month warranty.
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